Because Bitfinex is making news that they can pay back the former thefts which no one thought to be mathematically possible, so it means that Bitfinex is trying to raise confidence so more people will put their money there, so it indicates they need money. It also indicates they stole the money from Peter to pay Paul. The likely source of the money is perhaps coming from printing USDT out-of-thin-air.
The conversion of BFX tokens to shares of Bitfinex completed and was the catalyst for full token redemption on the exchange. Interestingly, the amount of capital raised is 54513657[1]. This number is quite close to the total authorized line and, since Bitfinex is associated, I have to wonder whether there's any connection.
I've been opposed to the idea of a pegged unit well before Coinapult had its "locks" and still view such a system with suspicion for anything beyond very short-term utilization.
[1]
https://bnktothefuture.com/search/pitches